After blood donation, you can eat more food rich in protein, folic acid, vitamin B12 and iron, and less spicy, stimulating and greasy food. By strengthening your diet, you can promote hemoglobin production in your body and ease the discomfort reaction after blood donation. The main precautions after blood donation are to pay attention to rest and keep the needle holes hygienically clean. Diet: 1. Protein-rich foods: After blood donation, you can eat more protein-rich foods, such as eggs, lean meat, milk, soy products and fish, to increase the absorption of protein. 2. Folic acid-rich foods: Folic acid has a certain role in promoting protein synthesis and cell division, and to a certain extent, avoiding the occurrence of anemia. Folic acid-rich foods include animal liver, spinach, cabbage, strawberries, grapes, etc.; 3. Vitamin B12-rich foods: Vitamin B12 can be combined with folic acid to promote hemoglobin maturation. Foods rich in vitamin B12 are mostly meat, such as liver, kidney, heart and other parts. Eggs, milk and cheese are also rich in vitamin B12; 4. Foods rich in iron: Iron can speed up hemoglobin recovery. Foods containing iron include shiitake mushrooms, pig liver, fungus, kelp and meat. You should avoid eating spicy, stimulating and greasy foods after blood donation because they are not easy to digest and lead to more blood concentration in the stomach, which will instead cause discomfort. Second, precautions should be taken to rest for a while after blood donation, do not get up immediately to prevent transient cerebral ischemia from occurring and leading to fainting. Do not remove the needle dressing for 4 hours, keep it clean and do not take a bath for 1-2 days to prevent needle infection. On the day of blood donation, you should take more rest, do not engage in overhead work, high temperature work, or drive a vehicle, and avoid high intensity activities. Usually, the blood volume can be normalized within 48 hours after blood donation, and various blood cells and plasma components can be normalized within 2-3 weeks.